Ein neuer, einfacher Zugang zu Alkalimetalloxometallaten

Abstract

Hochreaktiv sind die aus Alkalimetallaziden in situ gebildeten Alkalimetalloxide. Deren Umsetzung zu ternären Oxiden verläuft aber kontrolliert und bietet damit ein elegantes Syntheseverfahren für Alkalimetalloxometallate.

The AFeO2 (A=K, Rb and Cs) family: A comparative study of structures and structural phase transitions

“…The title compounds KFeO 2 , RbFeO 2 , and CsFeO 2 were prepared along the azide/nitrate route [32] as olive green, microcrystalline, pure phases in gram amounts. All of those oxoferrates(III) compounds crystallize in the KGaO 2 type of structure, at room temperature, which is a displacive, ordered variant of the CsAlO 2 type (see Fig.…”

“…All the three AFeO 2 (A= K, Rb and Cs) compounds were synthesized with the help of the azide nitrate route [32,33], whereupon the concomitant structures and phase transitions in the AFeO 2 (A= K, Rb, Cs) compounds were systematically investigated by high resolution synchrotron X-ray powder diffraction technique. The low-temperature and high-temperature modifications of all three compounds are isostructural to each other.…”

“…All the samples of the isostructural series AFeO 2 (A =K, Rb, Cs) were prepared using the ''azide nitrate route'' [32,33] …”

Rb3CoO2, a Novel Oxocobaltate(I) Synthesized via the Azide/Nitrate Route

“…Rubidium azide was synthesized from aqueous HN 3 [1]) provided with a silver inlay. Rubidium azide was synthesized from aqueous HN 3 [1]) provided with a silver inlay.…”

“…Recently we presented a novel approach to the synthesis of alkali oxometalates [1] that preserves the advantages, but avoids the disadvantages of using alkali metal oxides. This procedure is based on the fact that alkalimetal azides and nitrates (or nitrites) can comproportionate to form nitrogen and the respective alkalimetal oxides.…”